This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 12 |
| 2 | 120 |
| 3 | 252 |
| 4 | 240 |
| 5 | 660 |
| 6 | 32760 |
| 7 | 84 |
| 8 | 8160 |
| 9 | 14364 |
| 10 | 6600 |
| 11 | 3036 |
| 12 | 65520 |
| 13 | 156 |
| 14 | 24360 |
| 15 | 429660 |
| 16 | 16320 |
| 17 | 204 |
| 18 | 69090840 |
| 19 | 228 |
| 20 | 541200 |
| 21 | 75852 |
| 22 | 30360 |
| 23 | 12972 |
| 24 | 2227680 |
| 25 | 3300 |
| 26 | 82680 |
| 27 | 43092 |
| 28 | 48720 |
| 29 | 20532 |
| 30 | 3407203800 |
| 31 | 372 |
| 32 | 32640 |
| 33 | 4271652 |
| 34 | 2040 |
| 35 | 328020 |
| 36 | 10087262640 |